I have a built 4l80e with multi disc lock up convert.I installed the usshift quick 1 box amd have it set up. I am using the 4l80e normal program. It is giving me a F:rs code in 3rd gear only. It shifts in third and holds it till 4th is commanded. I have replaced all the electrical stuff in the trans still same fault. I am running a holley hp efi to control motor. In settings do i have to change anything? I changed my gear ratio and set my tps but left everything else alone.Fluid is clean and not burnt reverse works fine. Any ideas? It has jakes d1 brake also.

 

Send me your email address and I'll send you a cal file I made, you can try (youll just have to set open and closed voltage, and adjust your rev limit). It's fixed a few others' issues.